Move remote write API to client_golang/exp

Signed-off-by: Saswata Mukherjee <[email protected]>

Makefile

@@ -55,8 +55,8 @@ fmt: common-format $(GOIMPORTS)
 proto: ## Regenerate Go from remote write proto.
 proto: $(BUF)
 	@echo ">> regenerating Prometheus Remote Write proto"
-	@cd api/prometheus/v1/remote/genproto && $(BUF) generate
-	@cd api/prometheus/v1/remote && find genproto/ -type f -exec sed -i '' 's/protohelpers "github.com\/planetscale\/vtprotobuf\/protohelpers"/protohelpers "github.com\/prometheus\/client_golang\/internal\/github.com\/planetscale\/vtprotobuf\/protohelpers"/g' {} \;
+	@cd exp/api/remote/genproto && $(BUF) generate
+	@cd exp/api/remote && find genproto/ -type f -exec sed -i '' 's/protohelpers "github.com\/planetscale\/vtprotobuf\/protohelpers"/protohelpers "github.com\/prometheus\/client_golang\/internal\/github.com\/planetscale\/vtprotobuf\/protohelpers"/g' {} \;
 	# For some reasons buf generates this unused import, kill it manually for now and reformat.
-	@cd api/prometheus/v1/remote && find genproto/ -type f -exec sed -i '' 's/_ "github.com\/gogo\/protobuf\/gogoproto"//g' {} \;
-	@cd api/prometheus/v1/remote && go fmt ./genproto/...
+	@cd exp/api/remote && find genproto/ -type f -exec sed -i '' 's/_ "github.com\/gogo\/protobuf\/gogoproto"//g' {} \;
+	@cd exp/api/remote && go fmt ./genproto/...

api/prometheus/v1/remote/remote_api_test.go → exp/api/remote/remote_api_test.go

@@ -27,7 +27,7 @@ import (
 	"google.golang.org/protobuf/testing/protocmp"
 
 	"github.com/prometheus/client_golang/api"
-	writev2 "github.com/prometheus/client_golang/api/prometheus/v1/remote/genproto/v2"
+	writev2 "github.com/prometheus/client_golang/exp/api/remote/genproto/v2"
 )
 
 func TestRetryAfterDuration(t *testing.T) {

exp/exp.go

@@ -0,0 +1,17 @@
+// Copyright 2019 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// package exp contains experimental utilities and APIs for Prometheus.
+//
+// This package is experimental and may contain breaking changes or be removed in the future.
+package exp

internal/github.com/planetscale/vtprotobuf/protohelpers/protohelpers.go

@@ -5,18 +5,19 @@
 package protohelpers
 
 import (
+	"errors"
 	"fmt"
 	"io"
 	"math/bits"
 )
 
 var (
 	// ErrInvalidLength is returned when decoding a negative length.
-	ErrInvalidLength = fmt.Errorf("proto: negative length found during unmarshaling")
+	ErrInvalidLength = errors.New("proto: negative length found during unmarshaling")
 	// ErrIntOverflow is returned when decoding a varint representation of an integer that overflows 64 bits.
-	ErrIntOverflow = fmt.Errorf("proto: integer overflow")
+	ErrIntOverflow = errors.New("proto: integer overflow")
 	// ErrUnexpectedEndOfGroup is returned when decoding a group end without a corresponding group start.
-	ErrUnexpectedEndOfGroup = fmt.Errorf("proto: unexpected end of group")
+	ErrUnexpectedEndOfGroup = errors.New("proto: unexpected end of group")
 )
 
 // EncodeVarint encodes a uint64 into a varint-encoded byte slice and returns the offset of the encoded value.